Multicast time synchronization settings - Metasys - LIT-12013352 - M4-SNE10500-0 - M4-SNE10501-0 - M4-SNE11000-0 - M4-SNE11001-0 - M4-SNE110L0-0 - M4-SNE110L1-0 - M4-SNE22000-0 - M4-SNE22001-0 - Supervisory Device - SNE10 Network Engine - SNE11 Network Engine - SNE22 Network Engine - SNE Supervisory Network Engine - 12.0

SNE Commissioning Guide

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SNE10 Network Engine
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SNE Supervisory Network Engine
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The following table describes the Multicast time synchronization attributes.

Table 1. Multicast Time Synchronization Fields



Multicast Group Address

Specifies the IP address used to multicast the SNTP message. This address identifies the group of devices to receive the SNTP message. The RFC-2030 defined standard address is The address is configurable to allow site-specific use.

Multicast UDP Port

Specifies the UDP port on which Multicast time synchronization polls and listens for messages. The RFC-2030 defined standard port is 123.The UDP port defined here must match the Time Server’s UDP port for successful polling to occur.

Multicast TTL

Specifies the Time-to-Live (TTL) for a Multicast message. The value indicates the number of router hops allowed (number of routers to pass through) before the message is not sent. Routers must be configured to pass Multicast messages to allow the time sync message to pass.

Note: A default value of 1 typically stops the Multicast message from leaving the IP subnet of the Site Director. Most routers decrease the existing TTL upon arrival of a packet, and drop the packet instead of rerouting it when the TTL reaches 0.

Multicast Heartbeat Interval

Specifies the number of minutes between forcing a Multicast time synchronization message from the Site Director to participating devices.